What size sand filter is recommended for an 18 x 34 x 48 above ground doughboy pool?

Answers:
Depends entirely on what size and model pump you have. The pump is sized to give a certain amount of flow- in gallons per minute. You must get a filter rated to handle that much water. It's easy to undersize a filter. Just as easy to oversize it. This is rather a non-answer, but it is the best I can offer not knowing more.

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